to a weblog entry by Firefox hacker Ben Goodger
about memory usage in Firefox 1.5. "What I think many people are talking about however with Firefox 1.5 is not really a memory leak at all. It is in fact a feature.
To improve performance when navigating (studies show that 39% of all page navigations are renavigations to pages visited < 10 pages ago, usually using the back button), Firefox 1.5 implements a Back-Forward cache that retains the rendered document for the last few session history entries. This can be a lot of data. It's a trade-off. What you get out of it is faster performance as you navigate the web.
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